Hydraulic oil filters mainly work in the following ways:
1. ** Filter impurities **
- ** Interception of large particulate impurities ** : when the hydraulic oil enters the filter, it will first flow through the pre-filter. The pre-filter can intercept large particulate pollutants in the hydraulic oil, such as metal scraps, dust, etc., to prevent these large particulate impurities from entering the subsequent filter paper or filter screen, and play a preliminary protective role [^1^].
- ** Fine filter impurities ** : The hydraulic oil through the pre-filter will continue to flow to the core filter components such as filter paper or filter screen. There are many tiny pores in these filter media, the size of which is usually between a few microns and tens of microns. When the hydraulic oil passes through, the solid particles, pollutants and impurities in it will be effectively captured by these micropores, and the clean hydraulic oil can continue to flow through the micropores [^1^].
2. ** Keep oil clean **
- ** Continuous purification of oil ** : during the operation of the hydraulic system, the hydraulic oil circulates continuously and passes through the hydraulic oil filter. The filter continuously filters the oil to remove the newly generated impurities mixed with the outside world, so that the hydraulic oil is always maintained at a certain level of cleanliness, so as to ensure the normal operation of the hydraulic system [^1^][^3^].
- ** Prevent component wear ** : Clean hydraulic oil is essential for various components in hydraulic systems. If the hydraulic oil contains too many impurities, it will lead to increased wear between the components, affecting the service life and performance of the components. By keeping the oil clean, the hydraulic oil filter can reduce the wear of components and prolong the service life of the hydraulic system [^4^].
3. ** Maintain system pressure stable **
- ** Prevent clogging and pressure loss ** : with the growth of use time, a large number of pollutants will gradually accumulate on the filter paper or filter screen. If you do not replace the filter element or clean the filter screen in time, it will cause the filtration efficiency of the filter to decrease, and may even cause blockage. Once the filter is blocked, the oil flow of the hydraulic system will be poor, resulting in pressure loss and affecting the normal work of the system. Therefore, it is necessary to check and replace the filter element or screen regularly to maintain the normal pressure of the system [^1^].
- ** Ensure system pressure balance ** : In some high-precision hydraulic systems, pressure compensation devices need to be installed to ensure that the filter can maintain a stable working pressure under different working conditions, so as to ensure the reliability and stability of the hydraulic system.
In short, the hydraulic oil filter plays a crucial role in the hydraulic system. It effectively protects the normal operation of the hydraulic system and the service life of the components through multi-stage filtration, bypass valve design and automatic sewage discharge.